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15_3_Testing_with_Regtest.md
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@ -14,7 +14,7 @@ $ bitcoin-cli -regtest getbalance
``` ```
This will print the balance in your wallet. This will print the balance in your wallet.
## Testing the Regtest ## Validating the Regtest
Now you should be able to use this balance for any type of interaction with the private Blockchain, such as sending Bitcoin transactions according to [Chapter 4]((04_0_Sending_Bitcoin_Transactions.md)) in this guide. The only difference is that you need to use the flag `-regtest` when running the `bitcoin-cli` in order for the request to be sent to the Regtest Bitcoin daemon. Now you should be able to use this balance for any type of interaction with the private Blockchain, such as sending Bitcoin transactions according to [Chapter 4]((04_0_Sending_Bitcoin_Transactions.md)) in this guide. The only difference is that you need to use the flag `-regtest` when running the `bitcoin-cli` in order for the request to be sent to the Regtest Bitcoin daemon.
It is important to note that for your transactions to complete, you will have to generate/mine new blocks so that the transactions can be included into them. It is important to note that for your transactions to complete, you will have to generate/mine new blocks so that the transactions can be included into them.
@ -76,3 +76,65 @@ $ bitcoin-cli -regtest generate 6
"57193ba8fd2761abf4a5ebcb4ed1a9ec2e873d67485a7cb41e75e13c65928bf3" "57193ba8fd2761abf4a5ebcb4ed1a9ec2e873d67485a7cb41e75e13c65928bf3"
] ]
``` ```
## Testing with Regtest
When you are in the Regtest mode, you are able to simulate edge cases and attacks that might happen in the real world, such as Double Spend.
We are going to use the package [bitcointest by dgarage](https://github.com/dgarage/bitcointest) to simulate a transaction from one wallet to another, but you can check [their guide](https://www.npmjs.com/package/bitcointest) for more specific attack simulations, such as Double Spend.
First of all, you need to install Node.js, and use the NPM (Node Package Manager) to install `bitcointest`:
```
$ curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
$ sudo apt-get install -y nodejs
$ npm install -g bitcointest
```
After installing `bitcointest`, you can create the `test.js` file with the following content:
```
$ nano test.js
const { BitcoinNet, BitcoinGraph } = require('bitcointest');
net = new BitcoinNet('/usr/local/bin', '/tmp/bitcointest/', 22001, 22002);
graph = new BitcoinGraph(net);
try {
console.log('Launching nodes...');
const nodes = net.launchBatchS(4);
const [ n1, n2 ] = nodes;
net.waitForNodesS(nodes, 20000);
console.log('Connected!');
const blocks = n1.generateBlocksS(110);
console.info('Generated 110 blocks');
console.log(`n2.balance (before) = ${n2.getBalanceS()}`);
const sometxid = n1.sendToNodeS(n2, 100);
console.log(`Generated transaction = ${sometxid}`);
n1.generateBlocksS(110);
n2.waitForBalanceChangeS(0);
const sometx = n2.getTransactionS(sometxid);
console.log(`n2.balance (after) = ${n2.getBalanceS()}`);
} catch (e) {
console.error(e);
net.shutdownS();
throw e;
}
```
When running `node test.js`, the command outputs:
```
$ node test.js
Launching nodes...
Connected!
Generated 110 blocks
n2.balance (before) = 0
Generated transaction = 91e0040c26fc18312efb80bad6ec3b00202a83465872ecf495c392a0b6afce35
n2.after (before) = 100
```